皮皮学，免费搜题
登录
搜题
【单选题】
The boy said that the cheating was not an accident since ______ .A.
he decided to cheat as soon as he knew that there was going to be a test
B.
he had planned not to study before the test
C.
he had planned it with his friends before the test
D.
he decided to cheat after he had wasted the whole evening
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】A 、B为某平面图形上两点,A点加速度与AB垂直,图形的角速度在图示瞬时为零,角加速度方向如图所示则B点加速度方向为( )。
A.
指向A点
B.
垂直AB连线
C.
与AB直线夹角为θ,θ≠90°
D.
沿AB直线,背离A点
【简答题】感动 使 他的故事 大家 很
【多选题】当被测试系统响应时间过长,看不全整个响应过程时,可以采取的措施有
A.
减小输入方波信号的频率
B.
增加输入方波信号的周期
C.
根据可见的响应进行推测
D.
在响应过程中将信号源中的“ST”和“S”端之间的短路块拔掉