Structurally, the inside of early Christian churches was quite simple.
A. layout
B. design
C. interior
D. content
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This book is essential to anyone interested in space exploration.
A. dispensable
B. indisputable
C. indispensable
D. disputable
桥式整流电容滤波电路的变压器二次电压为20 V，当RLC≥(3～5)T／2时，输出电压为()。
A. 28 V
B. 9 V
C. 24 V
D. 18 V
The organization provides information on health issue to the public at large.
A. at length
B. in general
C. in detail
D. in brief
According to the author, major policy changes can only happen in______.
A. social security wealth in the United States
B. democratic countries
C. a country where and when opinion upholds change
D. all of the above
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