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【单选题】
胶体的层结构中吸附层和扩散层合称( )。A.
电位离子层
B.
反离子层
C.
固定层
D.
胶粒
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举一反三
【单选题】Jan is a security officer. Jan believes that it is important to know exactly who is in the office at any given time. She notices that some employees do not sign out of the office when they take lunch,...
A.
Jan believes that it is important that she know exactly who is in the office at any given time.
B.
Jan notices that some employees do not sign out of the office when they take lunch.
C.
Jan finds it impossible to keep track of who is actually in the office.
D.
Jan becomes frustrated with those employees who do not sign out of the office.
E.
Jan notes which employees leave the office without signing out, and reports them to their supervisors.
【简答题】钢中非金属夹杂物来源于两个方面,一是内生夹杂物,二是 夹杂物。
【简答题】如何在显微镜下区分外来夹杂物和内生夹杂物?
【单选题】The tour guide is _____ visitors around the city.
A.
show
B.
showing
C.
shows
D.
showed
【单选题】Do not leave out any _________ information. Otherwise, you may face serious consequences.
A.
vivid
B.
victory
C.
vital
D.
virtual
【简答题】连铸坯中的夹杂物，按（）分内生夹杂物和外来夹杂物。
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