轴承类型代号为6的轴承是（）轴承。
A、调心球轴承
B、推力球轴承
C、圆锥滚子轴承
D、深沟球轴承
参考答案：D
黑火药是由硫黄粉、硝酸钾和木炭按一定比例混合而成的，爆炸时的反应是：S+2KNO3+3C=K2S+N2↑+3CO2↑，该反应的还原剂是（ ）
A．C
B．S
C．KNO3
D．S和KNO3
(2013·甘肃兰州名校高三检测)The result was not the same ________ the professor had expected, ________ was rather disappointing.
A．as; which
B．which; as
C．as; that
D．that; which
