为保障公民临床急救用血的需要，国家提倡并指导择期手术的患者
A．率先献血
B．互助献血
C．自愿献血
D．自身储血
E．同型输血
参考答案：D
______ not only you but also Jack going to China next week?[ ]
A. Are
B. Is
C. Were
D. Was
图示连续梁，EI=常数，已知支承B处梁截面转角为-7Pl2／240EI（逆时针向），则支承C处梁截面转角φc应为（）
A.Pl2／60EI
B.Pl2／120EI
C.Pl2／180EI
D.Pl2／240EI
