问题
选择题
The old man has two sons. One is a worker; ______ is a teacher.[ ]
A. another.
B. other
C. others
D. the other
答案
答案：D
搜题请搜索小程序“爱下问搜题”
The old man has two sons. One is a worker; ______ is a teacher.[ ]
A. another.
B. other
C. others
D. the other
答案：D
kg的小球置于倾角为30°的光滑固定斜面上，劲度系数为k=200N/m的轻弹簧一端系在小球上，另一端固定在P点，小球静止时，弹簧与竖直方向的夹角为30°．取g=10m/s2．求：
毛笔悬空静止时，下列说法不正确的是： 