1219、程序句中,冒号前最多可以使用 20 个单词。

　In procedural sentences,you can use atyleast,20 words before the full stop.

　In procedural sentences,you can use a maximum of 20 words before the comma.

　In procedural sentences, you can use ca maximum of 20 words before the colon.

正确答案：C

解析：

解析:注释: full stop 句号;comma 逗号;colon 冒号。at least 至少,不少于; maximum 最多。

269、In a high concentration, this material is poisonous.

268、The flight crew can use the flight director commands to control the attitude of the airplane.

267、Do test B as an alternative to test A. 做测试 B 作为测试 A 的替代方案。

266、Care must be taken not to damage the firewall cover.

265、The topic sentence is the first and most important sentence in a paragraph.

264、The laptop has three primary parts.

263、The writing rules cover aspects of grammar and style. The dictionary gives the general words that awriter can use.

262、This method is recommended as minimizing errors of distribution, and also informs owners of theavailability of systems and equipment.

261、此步骤仅适用于包括极少量铆钉的修理。

260、This table that follows shows the data