【单选题】女,25岁。6年前诊断为风湿性心脏病,二尖瓣狭窄。常有咳嗽,气喘。今突感胸闷,口唇青紫,心率120次/分,血压135/90mmHg,听诊闻及两肺哮鸣音伴湿啰音,咯粉红色泡沫痰。应首选下列哪项药物治疗()
【简答题】已知y=3x-3,要使y≥x,则x的取值范围是______.
【单选题】已知 y= x-3 中,自变量x的取值范围是( )
【简答题】已知tanx- 3 ≥0,则x的取值范围是:______.
【单选题】Which company did the Steamer “General Grant” belong to?
A.
Pacific Mail Steamship Company
B.
River Tide Mailing Company
C.
Ocean Pacific Boat Company
D.
General Grant’s Sailing Company
【简答题】已知不等式为 1 3 ≤3 x <27,则x的取值范围是______.