34.When they entered the area,the visitors (require)___________to turn off their smartphones.
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35. When it comes to shopping habits, he suggested (buy)__________products that arc made from recycledmaterials.
判断题：()1､所有类型主减速器都能改变转矩旋转方向90°。
A. 对
B. 错
判断题：()2､从动锥齿轮与差速器壳用螺栓连接，从而二者装成一体。
A. 对
B. 错
判断题：()3､发动机横置和纵置时主减速器的齿轮齿形是一样的｡
A. 对
B. 错
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