滚涂的要领是用力先重后轻,匀速推滚,滚筒对工件表面施加的压力要均匀。( )
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阳极电泳涂膜的耐腐蚀性一般是阴极电泳涂膜的3~4倍。( )
A. 对
B. 错
Directions: This section is designed to test your ability to understand spoken English. You will hear a selection of recorded materials and you must answer the questions that accompany them. There are three parts in this section, Part A, Part B and Part C. Remember, while you are doing the test, you should first put down your answers in your test booklet, NOT on the ANSWER SHEET. At the end of the listening comprehension section, you will have 5 minutes to transfer your answers from your test booklet onto ANSWER SHEET 1. If you have any questions, you may raise your hand NOW as you will not be allowed to speak once the test is started. Now look at Part A in your test booklet.Part A You will hear a talk. As you listen, answer questions 1—10 by circling True or False. You will hear the talk ONLY ONCE. Every object is affected by the two forces at the same time: the pulling force and the spinning force.
A. 对
B. 错
新的混凝土和水泥砂浆表面,一般要求含水不小于8%,pH值不小于8。( )
A. 对
B. 错
电能按电压高低可分为高压电和低压电两类,在涂装生产中,一般采用低压电源为220V/380V的三相四线供电系统,照明电多采用220V,动力电多用380V,工频为50Hz。( )
A. 对
B. 错