船用空压机起动时可用()方法卸载。
A.顶开吸气阀
B.排气泄放
C.截断进气
D.A或B
参考答案:D
.—We’ll eat as soon as the meat is done.
—It has__________to cook for another five minutes.
A.still
B.yet
C.already
D.may
既能影响易水解药物的稳定性,又与药物氧化反应有密切关系的是
A.pH
B.广义的酸碱催化
C.溶剂
D.离子强度
E.空气