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【简答题】
若一双缝装置的两个缝分别被折射率为n1和n2（n1 > n2）的两块厚度均为e的透明介质薄片所遮盖，此时由双缝分别到屏上原中央极大处的两的光程差为____________。
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【单选题】Our teacher makes good use of any time______ he can spare.
A.
which
B.
that
C.
when
D.
in which
【单选题】I am impressed by the fact that he makes good use of every minute _____ he can spare.
A.
that
B.
in which
C.
in that
D.
when
【简答题】听下面一段材料，回答第1-4题。 1. What makes the man worried? A. He can’t find a good roommate. B. He lives far away from the school. C. He can’t afford the rent of that apartment. 2. What does the woman say about ...
【单选题】He makes good use of the time __________ he can spare.
A.
that
B.
when
C.
in which
D.
what
【单选题】________ his spare time that his English has improved a lot.
A.
So good use does he make of
B.
Such good use does he make of
C.
He makes very good use of
D.
He makes so good use of
【多选题】国有经济在国民经济发展中的主导作用具体体现在( )。
A.
掌握国家的经济命脉
B.
是整个国民经济的领导力量
C.
是社会主义国家的主要经济基础
D.
是社会主义建设资金的主要来源
E.
对整个国民经济沿着社会主义方向发展起着决定性的作用
相关题目：
【单选题】Our teacher makes good use of any time______ he can spare.
A.
which
B.
that
C.
when
D.
in which