These methods of testing are more costly than the other above mentioned tests and are ideal for use with weld coupons to determine the effectiveness of the passivation procedure for the system.
这些方法比上述检测方法费用要大，但它们是检测焊接样管以确定系统的钝化操作的效果的理想方法。
I have at different times in two years with the Haier redeem coupons in the mail on the way there did not think that all these problems, very disappointing giving up.
我分两次在不同的时间里用积分兑换的海尔礼券在邮寄的途中没想到竟然全都出现了些问题，太失望了准备放弃了。
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