1050、如必要,加一个垫圈。

　Add a fastener if necessary.

　Add a washer if necessary.

　Add a bracket if necessary

正确答案：B

解析：

解析:注释: fastener 紧固件;/washer 垫圈,垫片; bracket 支架,托架

439、A word in UPPERCASE letters is approved in STE. 大写字母的单词在 STE 中被批准。

438、Put the upper cam in the position that agrees with the mark you made at removal.

437、每个句子最多 20 个单词。

436、There is a change form on the next page, which is also available in electronic format on the STEMGwebsite.

435、The time between clicks must be 20 seconds.

434、The STEMG has records of all change forms produced and their assessments.

433、不要将不同主题的内容放在同一段落中。

432、Pages of permanently bound Handbooks need not be dated.

431、The symbol means all or most of the rules in that section.

430、The protective paint will prevent-corrosion for six months.