属单环β-内酰胺类的药物是
A.哌拉西林
B.头孢曲松
C.拉氧头孢
D.克拉维酸
E.氨曲南
参考答案:E
She couldn't ______ her words ______ by the students. [ ]
A. get; understanding
B. get; understood
C. make; to understan
D. make; understand
钻机的一般验收检查路线是()。
A.井口装置→钻台→机房→泵房→循环罐→循环槽→高压管汇→油灌区→发电房
B.机房→泵房→钻台→循环罐→循环槽→井口装置→高压管汇→油灌区→发电房
C.井口装置→高压管汇→油灌区→发电房→钻台→机房→泵房→循环罐→循环槽
D.钻台→机房→泵房→循环罐→循环槽→井口装置→高压管汇→油灌区→发电房