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【单选题】
已知圆环式螺线管的自感系数为L。若将该螺线管锯成两个半环式的螺线管，则两个半环螺线管的自感系数A.
一个大于L/2，一个小于L/2
B.
都小于L/2
C.
都等于L/2
D.
都大于L/2
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举一反三
【单选题】I _____ her carefully, but I _____ nothing. [ ]
A.
listened; heard
B.
listened to; heard
C.
heard; listened
D.
heard; listened to
【单选题】Rarely ______ such a silly thing.
A.
have I heard of
B.
I heard of
C.
I have heard of
D.
have I been heard of
【简答题】在下图中选出正确的断面图。
【单选题】I _____ carefully, but I _____nothing. [ ]
A.
listened to; heard
B.
listened; heard
C.
listened; hear
D.
heard; listened
【单选题】Rarely________such a silly thing。
A.
have I heard of
B.
I have heard of
C.
have I been heard of
D.
I have heard
【简答题】童年期儿童游戏属于( )。 (A)动游戏 (B)象征性游戏 (C)实物游戏 (D)规则游戏
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