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【单选题】
不能作注射剂溶媒的是A.
乙醇
B.
甘油
C.
1,3-丙二醇
D.
PEG300
E.
精制大豆油
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举一反三
【单选题】It’s necessary to have some____ knowledge for this job.
A.
electric
B.
electrical
C.
elctron
D.
electricity
【单选题】While sometimes it’s necessary to have phone calls in public, loud phone conversations are not so .
A.
believable
B.
acceptable
C.
considerable
D.
approachable
【简答题】深深地根植于 ,是社会主义核心价值观历史底蕴的集中体现
【简答题】A. 深深地根植于 ( ),是社会主义核心价值观历史底蕴的集中体现。 B. 中华优秀传统文化 C. 人类社会一切文明成果 D. 中华文化
【单选题】正四棱锥（底面正方形，顶点在底面的射影是底面的中心）的底面面积为Q，侧面积为S，则它的体积为（ ）
A.
1 3 Q S
B.
1 6 Q( S 2 - Q 2 )
C.
1 2 S( S 2 - Q 2 )
D.
1 2 Q( S 2 - Q 2 )
【单选题】It’s necessary for you _____ exercise every day.
A.
taking
B.
to take
C.
take
D.
takes
【简答题】It’s necessary for her to change her dress after a busy day. She needed __ her dress after a busy day.
【单选题】When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are .
A.
operational
B.
open
C.
closed securely
D.
at middle position
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