管工必须按“三按”施工,“三按”是指()、()和()。
参考答案:按图纸;按规范;按标准
we’ll go to the Great Wall___ there is heavy rain tomorrow.
OK! Walking on the Great Wall must be great fun.
A.as soon as
B.when
C.unless
D.if
LXP表示钢化玻璃。