辅助空气压缩机启动压力值为（）kpa，当压力值达到（）kpa时停止工作。
…李教授在考察日记中写道：“今天，天昏地暗，吹着强劲的东风，气温在－40℃。这时，在我的家乡珠江三角洲，早稻正在收割。”此时，李教授家乡的天气现象可能是（） ["霜降冻害","寒风刺骨","低温阴雨","狂风暴雨"]
The responsibilities of the engineer officer in charge of the watch do not include （） ["to ensure the main propulsion plant are kept under constant surveillance","to ensure the auxiliary systems are kept under constant surveillance","to inspect the steering gear spaces at suitable intervals","to inspect and overhaul the equipments in his charge"]
产品开发建议书包括哪些内容？
Which of the followings is not an indication of a bad maintenance?（） ["a pipe with welded connections","a pipe with several clips","a cement box","a leaking valve"]
营销人员应具备哪些素质？
