The winner of the race is tall and thin; he ___be my friend, Mike, who is short and fat.

A．might

B．mustn't

C．can't

D．should

对于难挥发的物料(常压沸点在150℃以上)，应采用( )蒸馏，这样可降低蒸馏温度，防止物料在高温下分解、变质或聚合。

A．真空

B．常压

C．加压

D．蒸汽