问题
选择题
They have the right to check ______ the 
will is valid(有效的), of course.
A．whether
B．why
C．when
D．how
答案
答案：A
搜题请搜索小程序“爱下问搜题”
They have the right to check ______ the will is valid(有效的), of course.
A．whether
B．why
C．when
D．how
答案：A
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。口内试冠时，发现锤造冠就位困难，
锤造冠翘动
锤造冠翘动的原因()