21的例句大全

Students below the age of 21 years must get their parents or guardians written consent.

不满21岁的学生需要父母或监护人的书面同意.

The Development of Armed Force in the 21's Century

二十一世纪的军队发展

Arthropod community including 21 different species on eggplant in plastic shed was divided into phytophagous, predacious, parasitic, hyper-parasitic and arachnid sub-communities.

茄子塑料大棚内节肢动物群落由21种物种组成，可分为植食性、捕食性、寄生性、重寄生性和蜘蛛等五个亚群落。

The clocks in Apia, the capital, are 21 hours behind Canberra but only four hours behind San Francisco.

萨摩亚首都阿皮亚比目前比堪培拉晚21个小时，但只比旧金山晚4个小时。

Among 6373 coal workers, the prevalences of anthracosis, chronic bronchitis and emphysema amounted to 0.26-15.2%, 21.9-36.9% and 11.8% respectively.

检查了6373名煤尘作业工人，煤肺患病率为0.26～15.2%，慢性支气管炎患病率为21.9～36.9%，肺气肿为11.8%。

It is approximately the LCM (lowest common multiple) of the synodic period (29.53 days), draconic period (27.21 days), and the anomalistic period (27.55 days) of the Moon.

沙罗周期日数约为朔望月周期（29.53 日）、 交点月周期（27.21 日） 和近点月周期（27.55 日） 的最小公倍数。

Since 1976 strong changes in seasonal cycle have taken place, with winters becoming warmer and summers colder. The annual range of monthly mean temperature in the latest 21 years was 1.7 ℃ less than in the earlier 43 years.

1976年起季节循环有明显变化，冬季变暖夏季变凉，月平均气温的年较差比前43年减小1.7℃。

Field investigation shows no permafrost in the interior of the Zoige Plateau. The mean annual air temperature is 0.6~ 3.3 ℃, and the annual range of air temperature is 19.1~ 21 2 ℃.

若尔盖高原内部年平均气温0.6～3.3℃，气温年较差19.1～21.2℃，已不具备多年冻土形成和保存的气候条件。

21 cases angulated upward, 7 cases angulated downward.

向上成角型21例，向下成角型7例。

In vivo, faint responsiveness of anergic T cells induced by SEA injections at 3 days interval and at 28 days interval could be seen respectively after 21 days and 28 days.

在体内，间隔3天组和间隔28天组中诱导的无能T细胞分别从末次注射后第21天和第28天开始出现较弱的应答反应。

34 cases in TG were given full parenteral alimentotherapy supplemented with mixed milk during the peri-operating period, while 21 cases in CG were only given mixed milk, all being given by nasal feeding 5-6 thimes a day.

观察组34例给予围手术期全胃肠外营养配合混合奶，对照组21例给予混合奶，每日鼻饲5-6次。

Adami et al. reported the prevalence of PHPT in Italian women aged 55~ 75 and the whole population was 21/ 1000 and 3/ 1000, respectively PHPT is not so common in China as in North America and no data of incidence is available.

根据意大利Adami等2002年的报告，PHPT患病率在55～75岁的妇女中为21／1000，在整个人群为3／1000。本病在我国较少见，自然发病率尚无确切数据。

Clinical analysis of surgical treatment to 21 cases of acetabulum fracture

髋臼骨折手术治疗21例临床分析

13.71% ethylene, 21.45% propylene and 11.34% butylenes were obtained under a reaction temperature of 610 ℃;

在兼顾乙烯和丙烯生产的操作条件下，乙烯、丙烯和丁烯产率分别达到13.71%、21.45%和11.34%；

Protected Agriculture ─ the Development Way of Button Mushroom Cultivation in Yunnan Province in 21 Century

设施农业&云南省21世纪双孢蘑菇栽培业的发展方向

The 21-day embryonic bursectomy and later 26-day embryonic bursectomy did not differ in effect on peripheral lymphoid organs.

胚胎中晚期和胚胎晚期切除腔上囊对外周淋巴器官发生的影响差别不大。

21 days after taking brain, measurement of bufo single amine oxidase, superoxide dismutase ( sod) and of mda. Results: 1.

21天后断头取脑，测单胺氧化酶、超氧化物歧化酶和丙二醛的含量。

Huawei was followed by Oppo and Vivo, which sold 21 million and 16 million units, respectively.

而华为之后则是Oppo和Vivo，出货量分别达到了2100万台和1600万台。

Nineteen fatty acids ( 12.931 mg/ g dry matter) were found in the body walls, and 21 ( 5.782 mg/ g wet matter) in the alimentary canals.

体壁及消化道中脂肪酸分别是19种和21种，其总量为12.931mg/g（干重）、5.782mg/g（湿重）。

She is Wang Ju, a contestant on the ongoing reality music competition show Produce 101, which premiered on Tencent Video on April 21.

她就是现正热播的真人音乐竞赛类节目《创造101》中的选手王菊，该节目于4月21日在腾讯视频首播。