下列说法不正确的是 [ ] A.分子为C3H8与C6H14的两种有机物一定互为同

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问题:

下列说法不正确的是 [ ]

A.分子为C3H8与C6H14的两种有机物一定互为同系物

B.具有相同通式的有机物不一定互为同系物

C.两个相邻同系物的分子量数值一定相差14

D.分子组成相差一个或几个CH2原子团的化合物必定互为同系物

考点:同系物
题型:选择题

句型转换(不改变原句的意思)

小题1:As soon as he finished his studies, he started traveling in China.

__________ __________ his studies, he started traveling in China.

小题2:You should hand in your homework tomorrow.

You are _______ ________ hand in your homework tomorrow.

小题3:Many famous actors keep fit by doing exercise in the gym every day.

Many famous actors keep fit by _____ _____ in the gym every day.

小题4:China Daily is not only a newspaper. Reading it every day can also improve our English.

China Daily is ______ _____ a newspaper. Reading it every day can also improve our English.

小题5:I insist that Mary should arrive at the school gate ahead of time.

I insist ________ Mary’s ________ at the school gate ahead of time.

题型:选择题

林可霉素或克林霉素与阿片类药联用时应注意

A.呼吸抑制增强

B.镇痛作用减弱

C.抗菌效果减弱

D.相互竞争作用部位

E.阿片类药物成瘾

题型:选择题

关于黑洞的质量,下列说法正确的是()

A、一定是无穷大

B、不一定是无穷大,但至少应该接近无穷大

C、不一定是无穷大,而且有可能质量相当小

D、大约10个太阳质量或以上

题型:选择题

片剂湿法制粒时,其湿颗粒的干燥温度应控制在50~60℃。()

题型:选择题

自然保护区的保护利用对策?

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