鉴别葡萄球菌属和链球菌属的试验是（）
A.DNA酶试验
B.O／F试验
C.触酶试验
D.凝固酶试验
E.以上都不是
参考答案：C
____, he does not know the answer.
A．As he is a teacher
B．As he is teacher
C．A teacher as he is
D．Teacher as he is
巡回检查次数每班应不少于（）次。
A.1-2
B.2-3
C.3-4
D.4-5
