【单选题】What did the staff do after they returned to the company?
A.
they visited each visitor
B.
they followed each lead by e-mail or letter
C.
they telephoned each visitor
【单选题】What did the staff do after they returned to the company?
A.
They visited each visitor
B.
They followed each lead by email or letter
C.
They telephoned each visitor
【多选题】下列关于悬滴法的主要用途说法正确的是()
B.
悬滴法适用于单细胞微生物、霉菌、放线菌孢子等的结构和形态观察
C.
悬滴法主要用于细菌运动性观察,借此可快速、简便的判断细菌是否有鞭毛
【判断题】选择合理的刀具几何角度以及适当的切削用量都能大大提高刀具的使用寿命。
【单选题】What did the staff do after they returned to the company?
A.
They visit each visitor.
B.
They followed each lead by email or letter.
C.
They telephoned each visitor
【判断题】选择合理的刀具几何角度以及适当的切削用量都能大大提高刀具的使用寿命
【判断题】换向阀是通过改变阀芯在阀体内的相对位置来实现换向作用的。
【简答题】用集成同步计数器74161设计十三进制计数器,若用反馈置数法,初始计数状态为2,则最高的计数状态为 (______________) B 。
【简答题】用集成同步计数器74161设计十进制计数器,若用反馈置数法,初始计数状态为2,则最高的计数状态为: (______________) B 。