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【单选题】
某年某地 6 岁女孩生长发育情况如下:身高均数为 119cm ,标准差为 4.56cm ,体重均数为 20kg ,标准差为 1.16cm ,欲比较两者的变异程度,用的指标是A.
均数
B.
标准差
C.
变异系数
D.
全距
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举一反三
【单选题】Please turn to you teachers if you have any trouble ______ your studies.
A.
about
B.
with
C.
in
D.
on
【单选题】图7-26所示的矢量图中,交流电压u 1 与u 2 的相位关系是( )。
A.
u 1 比u 2 超前75°
B.
u 1 比u 2 滞后75°
C.
u 1 比u 2 超前30°
D.
无法确定
【单选题】听力原文：W: Could you please turn down your TV a little? M: Sorry! Are you still preparing for the final exam? Q: Why did the woman ask the man to turn down the TV? (2)
A.
She didn't want to watch TV.
B.
She wanted to go to bed.
C.
She wanted to listen to the radio.
D.
Her study was disturbed.
【单选题】Please turn to your _____. I need to give this injection into your hip.
A.
side
B.
sick
C.
sign
D.
site
【单选题】Please __your book and turn to page51
A.
take up
B.
take out
C.
take off
D.
take down
【单选题】听力原文：W: Would you please turn down your radio a little? It's too loud for me to go to sleep. M: I'm terribly sorry to have disturbed you. Q: Why does the man say sorry to the woman? (16)
A.
Because he disliked his radio.
B.
Because he didn't return the radio to the woman.
C.
Because he left his radio too loud.
D.
Because he wanted to go to bed.
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