建筑给排水与采暖材料、配件及设备资料仅有合格证明而无材质技术数据的，均为不符合要求。()
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对承重结构的混凝土、防水混凝土和有特殊要求的混凝土都应有开盘鉴定。()
I kept looking at the man, wondering _________.
A. whether I have seen him before
B. where I had seen him before
C. that I had seen him before
D. whenver I had seen him before
It is said that air pollution has ________ the rise of the global temperature
A. led into
B. led to
C. led
D. led by
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