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问题 选择题

下列烷烃在光照下与氯气反应，只生成四种一氯代烃的是                    [ ]

A．CH3CH2CH2CH3              

B．CH3CH(CH3)2 

C．CH3C(CH3)3                  

D．(CH3)2CHCH2CH3

答案

答案：D

填空题

长方形的一边长等于3a+2b，另一边比它小a﹣b，那么这个长方形的周长是（    ）．  
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单项选择题

The nurse is preparing to remove a previously applied topical medication from a client. The rationale for removing previously applied topical medications before applying new medications is to （）.

A．decrease the possibility of absorption on the nurse's skin.

B．allow distribution of medication.

C．prevent soiling of the client's clothes.

D．avoid administering more than the prescribed dose.
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