盘车状态下用少量蒸汽加热,高压缸加热至150℃时再冲转,减少了蒸汽与金属壁的温差,温升率容易控制,热应力较小。
参考答案:对
He was accused _____taking ______drugs when he was at school , so he was questioned by the police.
A.of; up ;
B.for; down
C.of ; on
D.from; into
就矿产资源而言,南方比北方丰富的是[ ]
A.有色金属
B.煤炭
C.铁矿
D.石油