皮皮学，免费搜题
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搜题
【单选题】
识别大肠杆菌 DNA 复制起始区的蛋白质是A.
DnaA
B.
DnaB
C.
DnaC
D.
ORC
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】有关母乳正确的是
A.
母乳中钙磷比例适当(2:1),易被婴儿吸收
B.
人乳中乙型乳糖含量丰富,利于脑发育
C.
人乳中饱和脂肪酸较多,有利于脑发育
D.
人乳中维生素K含量较低
E.
人乳中含有大量的免疫活性细胞
【单选题】It is the third time that Susan ______ late to work and it’s high time that she ________the truth.
A.
has come; tell
B.
has come; told
C.
came; should come
D.
had come; told
【简答题】It's high time the government ______ some measures to raise people' s awareness of environmental protection.
【单选题】--- It’s the fourth time that heavy smog(雾霾) has hit the city this month. --- It’s high time we _______ measures to fight air pollution.
A.
will take
B.
took
C.
to take
D.
taking
【多选题】水泵安装的外观质量检查包括( )。
A.
泵壳不应有裂纹、砂眼及凹凸不平的缺陷
B.
多级泵的平衡管路应无损伤或折陷现象
C.
蒸汽往复泵的主要部件、活塞及活动轴必须灵活
D.
水泵试运转时，叶轮与泵壳不应相碰，进、出口部位的阀门应灵活
E.
轴承温升符合产品说明书的要求
【简答题】It’s high time that we _____ home and _____supper now. A.go…have B. went…had C.go…should have D. went…to have
【单选题】It’s high time that something, ____ to prohibit selling fake commodities.
A.
must be done
B.
was done
C.
be done
D.
were done
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