下列属于胆碱酯酶复活药的是()。
A.马拉硫磷
B.对硫磷
C.内吸磷
D.双复磷
E.对氧磷
参考答案:D
The teacher together with the students _____discussing Reading Skills that ______newly published in America.
A.are; were
B.is; were
C.are; was
D.is; was
金刚石单动双管内管短节的外径小于内管外径。