皮皮学，免费搜题
登录
搜题
【单选题】
质量为1kg物体在坐标原点处从静止出发在水平面内沿 轴运动,其受合力方向与运动方向相同,合力大小为F= ,那么开始运动3m内合力功为 ( ).A.
9J
B.
6J
C.
18J
D.
27J
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】I am one of the students who _________ English well in my class but he is the only one of us __________ maths well.
A.
studies; learns
B.
study; learns
C.
study; learn
D.
studies; learn
【单选题】English well, one must have a lot of practice.
A.
Speaks
B.
To speak
C.
Spoken
D.
Speak
【单选题】若要配置MSP430单片机的一个I/O端口引脚为输入,需要_________。
A.
清除方向寄存器位
B.
配置PxOUT寄存器位为输入数据值
C.
使PxOUT寄存器无效
D.
以上都是
【简答题】阅读理解。 One day three Frenchmen who did not know English very well were talking about the English language. The first Frenchman said, 'I heard someone shout 'look out', I put my head out of a window and...
【单选题】__________ English well, one must have a lot of practice.
A.
Speak
B.
Speaking
C.
To speak
D.
Speaks
【单选题】English well, one must have a lot of practice.
A.
Speak
B.
To speak
C.
Spoken
D.
Speaking
【简答题】I find that it is difficult to learn English well, so I mu.st study harder. I find ______difficul1. I find that it is difficult to learn English well, so I mu.st study harder. I find ______difficult__...
相关题目：
【单选题】若要配置MSP430单片机的一个I/O端口引脚为输入,需要_________。
A.
清除方向寄存器位
B.
配置PxOUT寄存器位为输入数据值
C.
使PxOUT寄存器无效
D.
以上都是