铣削不锈钢时,铣刀耐用度在()分钟是允许的。
A.160
B.170
C.180
D.100
参考答案:D
患者,男性,40岁,全身皮疹伴剧痒2小时,患者3小时前食龙虾,后全身多部位出现大块状红色皮疹伴有剧烈瘙痒,皮疹自行消退后可于其他部位反复出现,消退后不留痕迹,病程中无腹痛及胸闷。查体:躯干、四肢见大片状淡红色风团,不规则形状。
根据其皮疹表现应诊断为()
A.皮肤划痕征
B.血管性水肿
C.急性荨麻疹
D.湿疹
E.毒性红斑
Our government has taken some measures to overcome the lack of electricity, but it may take
some time ____ we have enough power. [ ]
A. since
B. after
C. unless
D. before