刀具磨损后将影响（）和加工质量。 A.切削力、切削温度 B.切削力、切削速度 C.切

士官的定义是什么？

如图所示，一高度为h=0.2m的水平面在A点处与一倾角为θ=30°的斜面连接，一小球以v₀=5m/s的速度在平面上向右运动。求小球从A点运动到地面所需的时间（平面与斜面均光滑，取g=10m/s²）。某同学对此题的解法为：小球沿斜面运动，则，由此可求得落地时间t。问：你同意上述解法吗？若同意，求出所需时间；若不同意则说明理由并求出你认为正确的结果。

当水位高至Ⅲ值时，保护系统动作（）。

A、发出预告信号；

B、开启事故放水门；

C、发出停炉信号。

治疗急症时，宜选用( )

A．募穴

B．郄穴

C．八会穴

D．络穴

E．原穴

An analyst does research about market structures. With respect to traditional oligopoly model, which of the following is least accurate The kinked demand curve model assumes:

A. that there is a break in the marginal revenue curve.
B. that the price decreases by one firm is followed by its peers.
C. that the price and quantity are sensitive to small cost changes.