诊断右心衰竭时，最可靠的体征是
A．肝颈静脉回流征阳性
B．肝肿大
C．下肢水肿
D．腹水
E．胸水
参考答案：A
— How do you usually find out about new software?
— In the magazines like Popular Electronics. That's _____ computer companies usually advertise. [ ]
A. which
B. where
C. what
D. why
木材的纤维饱和点是木材细胞壁内充满水时的含水率，这种水是( )
A．自由水
B．吸附水
C．游离水
D．结合水
