抗冻砂浆不能用于要求砂浆标号高于()的重要工程。
A、M5
B、M10
C、M15
D、M20
参考答案:C
A new study finds that sitting can shorten a person’s life almost as much as smoking can, which _______ just how damaging inactivity can be.
A.estimates
B.highlights
C.dominates
D.ensures
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