有机磷农药中毒患者烟碱样症状的描述正确的是
A.呕吐、腹痛、腹泻
B.流涎
C.支气管痉挛及分泌物增加
D.肌纤维颤动
E.昏迷
参考答案:D
The student did not catch the last bus, _______, it began to rain cats and dogs.
A.in the flesh
B.at times
C.what’s worse
D.back and forth
下列哪种物质可以作为水基压裂液的PH值调节剂。()
A.硫代硫酸钠
B.氢氧化钠
C.过硫酸铵
D.氯化铵