启闭机转动部件检查的内容是，转动部件是否（）。
A、灵活
B、松动
C、卡阻
D、锈蚀
参考答案：A
_____ to blame him for neglect of duty? The president of the company is his uncle.
A．What good it is
B．How good it is
C．What good is it
D．How good is it
该图是某四国人口金字塔示意图，其中人口自然增长率最高的是（ ）
