当防护工程不能紧跟开挖施工时，应暂时留下一定厚度的保护层，待防护工程施工时再刷坡挖足。
参考答案：对
—I hear your grandpa your grandma like watching Beijing Opera.
—Right. just as many old people do in our city.[ ]
A. both: and
B. either: or
C. neither: nor
D. not only: but also
我行自营或代理买卖的实物黄金成色须在（）以上可质押。
A.99%
B.99.50%
C.99.90%
D.99.95%
