题目内容

涡街流量计的测量原理是。提示:4个字。

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超声波流量计的测量方法有、多普勒法、相关法等。

通电导体在磁场中受力用右手定则来确定。

A. 对
B. 错

笼型异步电动机不可以通过人为改变电动机的机械特性

A. 对
B. 错

Taking short steps is a safer and usually more successful approach to product developing because ___________.

A. development a revolutionary technology for use in a new product is risky and prone to failure
B. taking short steps can save more capital and resources
C. shorter steps are more difficult
D. massive research can speed up the product cycle.

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