【单选题】当t=0时,一简谐弹簧振子正经过平衡位置向X轴正向运动,此弹簧振子的运动方程可表示为( )
C.
a = a max sin(ωt - π/2)
【判断题】电力系统:是由发电厂变电站、输电线路和用电设备组成的统一整体,称为"电力系统"。
【单选题】听力原文:M: My family and I will be leaving on January 5. Is there anything we need to do to the apartment before we leave? W: If you want your fifty-dollar deposit back, you'll have to clean the stove an...
B.
She sells stoves and refrigerators.
C.
She's an apartment manager.
D.
She's a real estate agent.
【单选题】十字轴式刚性万向节的十字轴轴颈一般都是( )。
【多选题】关于网站banner的描述,下列选项说法正确的是()。
A.
Banner图是网站广告中最常见的广告形式。
B.
Banner图将文字信息图片化,以更直观的方式将信息进行展示。
C.
在设计时可采用左右构图、正三角构图、倒三角构图、对角线构图、扩散式构图的样式。
【简答题】从方框中选择适当的句子完成下列对话。 A. Ah...Is there anything serious? B. Thank you, doctor. C. I've got a bad headache. D. My temperature seems all right. E. About two days. A: What's your trouble? B: 1______ A: How ...
【单选题】听力原文:M: My family and I will be leaving on January 5. Is there anything we need to do to the apartment before we leave? W: If you want your fifty-dollar deposit back, you'll have to clean the stove an...
B.
She sells stoves and refrigerators.
C.
She's an apartment manager.
D.
She's a real estate agent.