栽道钉时,钉尖不要紧靠钢轨底边,要离开轨底边约为道钉厚度的()。
A、3/4
B、2/3
C、1/2
D、1/3
参考答案:C
“黄肠题凑”是木椁室发展的顶峰,“黄肠”指用松木的黄心积垒于棺外,“题凑’’指木头顶部皆内向。( )
No matter how bright a talker you are, there are times when it is better ______ silent.
A.remain
B.be remaining
C.to remain
D.having remained