能耗制动时，对主机状态的错误理解是（）。
A.主机转速高于发火转速
B.主起动阀打开，空气分配器工作
C.主机仍按原方向转动
D.主机已停油
参考答案：B
John was absent from school yesterday. He _____ a wonderful story to explain his absence.[ ]
A. put up
B. set up
C. made up
D. took up
治疗金黄色葡萄球菌所致慢性骨髓炎的药物为
A．青霉素类+林可霉素
B．头孢他定+林可霉素
C．青霉素类+链霉素
D．头孢孟多+环丙沙星
E．四环素+克林霉素
