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。
