单项选择题

链霉菌属放线菌的气生菌丝不发达，基内菌丝发达，无隔膜，不分枝，多交织成网状。

A．对
B．错

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单项选择题

39. Which of the following should be included in the concluding paragraph of a cover letter? A.
A)Your expected salary.
B.
B) Your hobbies and interests.
C.
C)Your request for a meeting.
D.
D) Your professional background

单项选择题

涂覆的作用是（）

A．保护光纤不受水汽侵蚀和机械擦伤
B．增加了光纤的机械强度与可弯曲性
C．延长光纤寿命的作用
D．其余答案均正确