He turned ________ ten years ago but lat

题型:选择题

问题:

He turned ________ ten years ago but later he became ________.   [ ]

A. a teacher; a doctor    

B. teacher; doctor  

C. teacher; a doctor    

D. a teacher; doctor

考点:不定冠词名词
题型:选择题
从B栏中找出和A栏相匹配的句子。
                                          A
( )1. Could you help me print the document?
( )2. Have you got a computer at home?
( )3. How do I save a document?
( )4. Where do you write its name?
( )5. What's the keyboard used for?
                               B
A. For writing in information.
B. Click "save" and write a name for it.
C. In the box.
D. Certainly, with pleasure.
E. Yes, I do.
题型:选择题

琥珀酸乙酯的键线式结构如图所示,下列关于它的说法不正确的是

[ ]

A.琥珀酸乙酯的分子式为C8H14O4

B.琥珀酸乙酯不溶于水

C.琥珀酸用系统命名法命名的名称为1,4-丁二酸

D.1mol琥珀酸乙酯在足量NaOH溶液中完全反应可得到2 mol乙醇和l mol琥珀酸

题型:选择题

试体龄期是从水泥加水搅拌开始试验时算起,不同龄期强度试验在时间里进行()。

A、24h±15min

B、48h±30min

C、72h±45min

D、7d±2h

题型:选择题

“对腰椎神经根受压者,可改变突出物与神经根的关系,从而缓解压迫症状”属于()

A.解除肌肉痉挛

B.矫治关节畸形

C.改善局部血液循环

D.改善或恢复关节活动范围

E.增大关节间隙,改善关节活动范围

题型:选择题

发育生物学作为一门学科,是在下列哪个年代创立的()。

A.1950~1960

B.1960~1970

C.1970~1980

D.1980~1990

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