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【单选题】
电离辐射的防护，主要是控制辐射源的质和量，外照射防护的基本方法有( )，通称“外防护三原则”。A.
空间防护、距离防护和时间防护
B.
时间防护、距离防护和屏蔽防护
C.
距离防护、空间防护和组织防护
D.
距离防护、屏蔽防护和组织防护
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皮皮学刷刷变学霸
举一反三
【单选题】Tom, ______ the other boys in our class, ______ playing games.
A.
like, likes
B.
like, like
C.
likes, likes
D.
likes, like
【单选题】_____ each other, the twin sisters are difficult to distinguish. [ ]
A.
To look like
B.
Looking like
C.
Looked like
D.
Look like
【单选题】Fuel oil contamination of an auxiliary diesel engine lube oil can result in ___________.
A.
an increased flash point
B.
higher lube oil pressures
C.
an increased viscosity
D.
lower lube oil pressures
【简答题】求两个二进制数A=1011，B=0101的逻辑与运算F?
【单选题】________like singing and dancing; _________ like playing chess. [ ]
A.
One; the other
B.
Some; the other
C.
Some; others
D.
Some; the others
【单选题】Some people like watching TV, but _____ say it is boring. [ ]
A.
the other
B.
another
C.
other
D.
others
【简答题】在等比数列 中， ， ，则公比q为 .
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