二尖瓣狭窄不会引起（）
A.心房增大
B.左心房增大
C.右心室增大
D.左心室增大
E.肺动脉高压
参考答案：D
What they gave us is ______ help; they gave us the confidence to live through the hard times.
A．much more than
B．no more than
C．no less than
D．much less than
24mLH2S在30mLO2中燃烧，在同温同压下，得到SO2的体积为（ ）
A．24mL
B．30mL
C．20mL
D．18mL
