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【多选题】
下列实验操作中错误的是 [ ]A.
蒸发操作时，应使混合液中的水分完全蒸干后，停止加热
B.
蒸馏操作时，应使温度计水银球靠近蒸馏烧瓶的支
C.
分液操作时，分液漏斗中下层液体从下口放出，上层液体从上口倒出
D.
萃取操作时，应选择有机萃取剂，且萃取剂的密度必须比
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【简答题】建设工程监理的概念是什么?
【单选题】The interviewee's suggestion for a creativity workout supports the view that
A.
brain exercising will not make people creative.
B.
most people have diversified interests and hobbies.
C.
the environment is significant in the creative process.
D.
creativity can only be found in great people.
【单选题】当发现负责值班的高级船员因疲劳的影响难以保证安全值班时,船长应( )。
A.
做好思想工作,鼓励其克服困难坚持值班
B.
配备精力充沛的其他人员配合其值班
C.
调整值班的安排,使之得到适当的休息,以利于下一个班次时能够胜任职责的要求
D.
亲自监督其值班,以保证航行安全
【单选题】Which of the following would the writer most probably agree to be a form. of mental exercise?
A.
Play PC games.
B.
Do sports.
C.
Read books.
D.
Watch TV.
【单选题】Physical and mental tasks were carried out by the women ______.
A.
prior to strenuous exercise
B.
following strenuous exercise
C.
before they were subjected to unusual pressure
D.
after they were subjected to unusual pressure
【单选题】当发现负责值班的高级船员因疲劳的影响难以保证安全值班时,船长应__。
A.
做好其思想工作,鼓励其克服困难坚持值班
B.
配备精力充沛的其他人员配合其值班
C.
调整值班的安排,使之得到适当的休息,以利于下一个班次时能够胜任职责的要求
D.
亲自监督其值班,以保证航行安全
【单选题】当发现负责值班的高级船员因疲劳的影响难以保证安全值班时，应（）
A.
做好其思想工作，鼓励其克服困难坚持值班
B.
配备精力充沛的其他人员配合其值班
C.
调整值班的安排，使之得到适当的休息，以利于下一个班次时能够胜任职责的要求
D.
A、B、C均可以
【单选题】We students should get ____ to ____ nature and take ____ at the same time. [ ]
A.
closely; the; exercise
B.
close; the; exercises
C.
close; /; exercises
D.
close; /; exercise
【单选题】．We have got a heavy snow there in my hometown this winter, which is a sign that this year _____ to be another good one for harvests.
A.
tells
B.
means
C.
promises
D.
intends
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