用无水乙醇配成一定浓度后,在280nm附近具有最大吸收的药物是
A.庆大霉素B.醋酸可的松C.苯丙酸诺龙D.炔雌醇E.黄体酮
参考答案:D
I didn't want to talk about that ______ the phone. [ ]
A. on
B. in
C. at
D. by
燃具排烟筒水平管道长度不应大于()
A、1.5m
B、4.5m
C、3m
D、5m