上颌第二磨牙近中颊根颊舌向双根管者约为
A.18%B.38%C.46%D.60%E.80%
参考答案:B
We are very annoyed ______ his mistake, because we have emphasized this for several times.
A.at/about
B.with
C.on
D.to
汽车制动跑偏是指在行驶中制动时不能按()方向减速停车。
A.行驶
B.弯道
C.直线
D.曲线