139.Corrosion can have many causes.

A. 　the lower seal comes into view when you pull the lower bearing down.

B. 　The lower seal shows as the lower bearing is pulled down.

C. 　The lower seal appears as the up bearing is pulled down.

A. 　Documents must be temporarily edible.

B. 　Documents must be readily revisable.

C. 　Documents must be permanently durable.

A. 　In terms of format, style and method of presentation of the rules written
in this specification, the material contained in Maintenance Manuals
designed by manufacturers should be prepared under the guidance of the
it.

B. 　In terms of format, style and method of presentation, the material
contained in Maintenance Manuals designed by manufacturers should be made
in accordance with the rules written in this specification.

C. 　The material contained in Maintenance Manuals designed by manufacturers
should be prepared under the guidance of the rules written in this
specification In terms of format, style and method of presentation.

A. 　批准性声明,需永久显示,类似于下面的例子。

B. 　适用性声明,需突出显示,类似于下面的例子。

C. 　适用性声明,需永久显示,类似于下面的例子。

A. 　INCIDENT

B. 　THING

C. 　IN FACT

A. 　GET DOWN

B. 　FALL TO

C. 　GO DOWN

A. 　the lower seal comes into view when you pull the lower bearing down.

B. 　The lower seal shows as the lower bearing is pulled down.

C. 　The lower seal appears as the up bearing is pulled down.

A. 　在这种结构中,液压流过这个活门。

B. 　在这种构型中,液压旁通这个活门。

C. 　在这种构型中,水流旁通这个活门。

A. 　如果调节止动不正确,测试结果将不准确。

B. 　如果调节止动未修正,测试结果将不准确。

C. 　如果止动点的调整不正确,测试结果将不准确。

A. 　 arms

B. 　 activates

C. 　 releases