我国东北重工业基地的一个企业--大唐机器制造公司是一个中型企业，主要产品是机电产品设

Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (54) an educational institution, and they are required to study for a (55) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (56) resources to support themselves (57) in this country.

In order to work here the foreigner needs a work permit, (58) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (59) these permits, and there is little that can be done (60) it; it would be extremely unwise for a foreign visitor to work (61) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (62) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (63) part-time jobs while they are studying here.

57().

A.after 

B.since 

C.while 

D.before

如图是实验室制取气体的装置图：

（1）填写下列仪器的名称：

①______　　②______　　③______

（2）用过氧化氢溶液制取氧气，选择发生装置是图______；用高锰酸钾制氧气，发生装置选择图______；写出过氧化氢溶液分解的反应文字表达式______．

（3）收集氧气的装置可选择图______和图______

（4）检验氧气的方法是______．

组成总体的每个个体必须在某些性质上是相同的，至少有一方面性质是相同的。（）

下列药物与麻醉并发症的关系组合，不正确的是（）

A.单胺氧化酶抑制剂并用哌替啶可致呼吸抑制、高热、昏迷、惊厥、低血压甚至死亡

B.左旋多巴并用氟哌利多可致锥体外系症状

C.奎尼丁可拮抗肌肉松弛剂的作用

D.青光眼病人用二乙氧磷酰胆碱可延长琥珀酰胆碱的作用

E.氯胺酮并用苯二氮类可减轻其中枢神经系统副作用

一次圆筒混合机的倾角一般为（）度。

A.2～4

B.5～6

C.1～2