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【单选题】
图所示电路中,已知 I1=0.8mA , R=50k Ω ,则电压U应为( )。A.
20V
B.
-20V
C.
50V
D.
-50V
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举一反三
【单选题】Mary found that ________ was always the best policy when she got involved in arguments with her husband.
A.
compose
B.
congratulate
C.
compromise
D.
content
【简答题】通过计算说明下列反应 : 2CuO(s) Cu 2 O(s) + 1/2O 2 (g) ( 1 )在常温 (298.15K) 、标准态下能否自发进行? ( 2 )在 700K 时、标准态下能否自发进行? 通过计算说明下列反应: 2CuO(s) → Cu2O(s) +1/2O2(g) (1)在常温(298.15K)、标准态下能否自发进行? (2)在700K时、标准态下能否自发进行?
【简答题】Mary found it difficult to ________ Jim’s father when he disapproved of their marriage. A) stand for B) stand out C) stand by D) stand up to
【简答题】Mary’s score on the test is the highest in her class; she ________ have studied very hard. A) may B) should C) must D) ought to
【单选题】Which of the following is true?
A.
Mary received the box but found nothing in it.
B.
Mary took the box to her garden safely from the truck.
C.
Mary dropped the box and it fell to the ground and broke.
【单选题】Mary found ______ extremely difficult to pass the examination.
A.
it
B.
this
C.
that
D.
what
【单选题】Not until the train pulled into the next station _____ her suitcase gone. [ ]
A.
Mary had found
B.
had Mary found
C.
did Mary find
D.
Mary found
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