SV-3探伤设备的液压系统应如何检查?
参考答案:液压泵工作是否正常,液压管线无泄漏;液压马达传动系统工作是否正常,无泄漏现象;液压翻拨系统工作是否正常。
Alex has been in China for quite a few years. ________, he speaks fluent Chinese.
A.Especially
B.Frequently
C.Surprisingly
D.Consequently
消费者以追求商品或服务的使用价值为主导倾向的购买动机是()
A、求实动机
B、求新动机
C、求美动机
D、求名动机