GB50325-2001规定,民用建筑工程室内用水性涂料,应测定其()的含量,其限量要符合规范要求。
A.VOCs
B.苯
C.游离甲醛
D.游离TDI
参考答案:A, C
.
_________ it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun.
A.That
B.What
C.Which
D.Whether
如果左、右手电极反接记录心电图。
记录的aVF导联心电图相当于实际心电图的()。
A.Ⅱ导联
B.Ⅲ导联
C.aVR导联
D.aVL导联
E.aVF导联