【单选题】Out-of-balance tires and propeller shafts are the most common causes of _______ vibration.
【单选题】Out-of-balance tires and propeller shafts are the most common causes of ______ vibration.
【单选题】03-18电梯安装施工工地应配备干粉灭火器、二氧化碳灭火器或( )。
【单选题】孩子从刚出生开始,就显出个别差异,主要体现在( )的差异。
【多选题】消费需要的基本特征主要表现在以下哪些方面。
【单选题】What will be the format of the exam?
A.
There will be only multiple-choice questions.
B.
The exam will be both multiple-choice questions and essay questions.
C.
There will be only essay questions.