治疗普通型流行性脑脊髓膜炎(简称流脑)的首选抗菌药物是()。
A.青霉素
B.磺胺药
C.氨苄西林
D.庆大霉素
E.红霉素
参考答案:A
—I can start to work next Monday.
—_________ then. I am glad to be able to offer you the job.
A.You can't be serious.
B.You're welcome.
C.That's right.
D.It's settled.
当物体所受合外力为零,而合外力矩不为零时,物体将发生()运动。