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【单选题】
将质量为10kg的小球挂在倾角α=30°的光滑斜面上,如图。当斜面的加速度至少为多大时,小球对斜面的正压力为零?( )A.
37m/s 2
B.
27m/s 2
C.
17m/s 2
D.
7m/s 2
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反馈参考答案：
举一反三
【单选题】管道供应公司发现,它的销售额变化的时间总是在房屋开工指数变化大约4个月之后发生。于是,房屋开工指数就成为管道供应公司预测其市场需求的一个非常有用的( )
A.
领先指标
B.
同步指标
C.
滞后指标
D.
并行指标
【单选题】Sam always has a lot of energy. ___, Nick always seems tired.
A.
Even so
B.
In contrast
【单选题】根据广西现行消耗量定额的规定,平整场地工程量按设计图示尺寸以( )计算。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
建筑物首层面积
B.
建筑物首层外围建筑尺寸每边各加2m prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
C.
建筑物首层建筑面积
D.
建筑物外墙外边线每边各加2m
【单选题】Sam is a very good man. He always tries __________ best to help others.
A.
he
B.
him
C.
his
D.
he’s
【单选题】Sam _____ walks to school. He always goes to school by bike.
A.
sometimes
B.
often
C.
never
【单选题】Sam doesn't like staying in one place, he always like to go _______. [ ]
A.
nowhere
B.
somewhere
C.
anywhere
D.
everywhere
【单选题】—Sam speaks English like a native.I always admire him.—Now he is learning more difficult language—
A.
—Sam speaks____ English like a native.I always admire him. —Now he is learning____ more difficult language—Arabic. A．an;a
B.
/;the
C.
/;a
D.
the;a
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