下列体征对判断上消化道活动性出血比较有帮助的是（）
A．体温升高
B．呼吸快
C．腹部压痛明显
D．腹水征阳性
E．肠鸣音活跃
参考答案：E
Can you think of some cases where drivers obviously______ the traffic rules but don’t obey them?
A．have instructed in
B．have instructed
C．have been instructed in
D．are instructed
限速器钢丝绳张紧装置上的安全保护开关，是在限速器钢丝绳断裂或松弛时，将（）开关断开，电梯被迫停驶
