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【单选题】
在通风橱中进行实验操作时,下列错误的时 ( )。A.
使用时通风柜门需关闭。
B.
使用过程中头部不得伸入通风柜内。
C.
为了保障排风不受阻碍, 不可堆放试剂或其他杂物。
D.
可存放与实验无关的物品。 第十章: 化学试剂泄漏及玻璃仪器破损的处置方法
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举一反三
【单选题】A patient has a microcytic, hypochromic anemia. In order to ascertain the cause of the anemia, the patient ’ s hemoglobin was isolated, and it was determined that there was much more β -chain present ...
A.
Alkali causes the two strands of DNA and RNA to separate.
B.
Heat causes the two strands of DNA and RNA to separate.
C.
Alkali cleaves the phosphodiester bonds of DNA and RNA, degrading them to nucleotides.
D.
Alkali separates the strands of DNA and degrades RNA to nucleotides.
E.
Alkali separates the strands of RNA and degrades DNA to nucleotides.
【简答题】The jury ___ to be isolated in individual hotel romms each night during the trial.(be)
【判断题】During the isolated years, athletes were among the few PRC nationals who were allowed to go abroad.
A.
正确
B.
错误
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