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【单选题】
谐振电路品质因数Q是由( )决定的。A.
电路上电压和电流的相位差
B.
电路上电压和电流的大小
C.
谐振电路的特性阻抗与电路中的电阻的比值
D.
电路上电压和电流的频率
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【单选题】已知平面应力状态下的单元体如图所示，则相应的第四强度理论的相当应力σr4=( )。【图片】【图片】
A.
184.4MPa
B.
170.6MPa
C.
150MPa
D.
190MPa
【单选题】Tasty coco powder, _____ with milk, _____ so good that that child will be asking for more. [ ]
A.
mixed; tastes
B.
was mixed; tastes
C.
to mix; taste
D.
mixing; taste
【单选题】已知平面应力状态下的单元体如图所示，则相应的第三强度理论的相当应力σr3=( )。【图片】
A.
184.4MPa
B.
170.6MPa
C.
150MPa
D.
190MPa
【单选题】Have you brought____ for Lindas birthday? Not exactly. Just some flowers
A.
something unusua
B.
anything unusually
C.
unusual something
D.
unusual anything
【单选题】Even if an advertisement does not lie, it does not mean it is altogether _______.
A.
constant
B.
unusual
C.
precious
D.
innocent
【简答题】这个曲子左手使用较多的指法是 。
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