肌间沟臂丛神经阻滞时，最易发生阻滞不全的是()
A．正中神经
B．桡神经
C．尺神经
D．桡神经和尺神经
E．正中神经和桡神经
参考答案：C
设备更新的特点包括()。
A.设备更新的核心工作是确定设备的自然寿命
B.设备更新的核心工作是确定设备的经济寿命
C.设备更新分析以费用年值法为主
D.设备更新分析只考虑未来发生的现金流量
E.只比较设备的费用
(2013·浙江金华二模)A survey has shown that 40% of those killed in traffic accidents ________ if they had been wearing seat belts.
A．should have been saved
B．must have been saved
C．need have been saved
D．could have been saved
