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【单选题】
牙刷一般多久换一次？A.
3个月
B.
1个月
C.
2个月
D.
5个月
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】坍落度是表示塑性混凝土( )的指标。
A.
和易性
B.
流动性
C.
粘聚性
D.
保水性 提示:塑性混凝土的流动性用坍落度表示,粘聚性和保水性主要采用目测及其它辅助方法来评定。
【简答题】The old lady treats the boy as if he were his own son.
【简答题】WASHINGTON — President Obama and his wife, Michelle, handed out Halloween treats to area children and military families at the White House Sunday evening． Local students between 6 and 14 years old, al...
【单选题】The old lady treats the boy as if he __________ her own child.
A.
had been
B.
was
C.
were
D.
is
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