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【单选题】
在正丁醚合成实验中,最合适的加热( )。A.
平面电阻炉直接加热
B.
酒精灯焰加热
C.
磁力搅拌加热套加热
D.
电热板加热
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皮皮学刷刷变学霸
举一反三
【简答题】某石材在气干、绝干、水饱和情况下测得的抗压强度分别为 174 、 178 、 165MPa ,求该石材的软化系数,并判断该石材可否用于水下工程。
【单选题】We have to finish the work now, _______?
A.
don't we
B.
haven't we
C.
have we
D.
do we
【简答题】He _________ ascribes the great improvements in his life to his uncle's generous encouragement and charitable care for him.
【单选题】We will have to be content______the few supplies we have now.
A.
of
B.
with
C.
for
D.
about
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