一板件与另一板件相交构成直角或近似直角的接头叫做（）。
参考答案：T型接头
The more one is______the English－speaking environment, the better he or she will learn the language.[ ]
A. exposed to
B. filled in
C. caught on
D. kept up
我国淡水资源总量约为()万亿m3
A.2.0
B.2.5
C.2.6
D.2.8
