锉齿轮轮齿、链轮，应该使用（）.
A.扁锉
B.半圆锉
C.菱形锉
D.刀锉
参考答案：C
It was announced that only when the terrible disease was under control _____ to return to
their homes.
A．the residents would decide
B．would the residents decide
C．would the residents be decided
D．the residents would be decided
等额让出可让利益的让步方式的缺点是？
