皮皮学，免费搜题
登录
搜题
【单选题】
Tom takes 20 minutes to cook an egg and 5 minutes to make a sandwich. Jerry takes 15 minutes to cook an egg and 3 minutes to make a sandwich. Tom has a comparative advantage in ________ and Jerry has a comparative advantage in ________.A.
cooking eggs; making sandwiches
B.
making sandwiches; cooking eggs
C.
neither of these activities; both activities
D.
both activities; neither of these activities
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】患者,24岁,妊娠34周,外伤后突然剧烈腹痛,伴少量阴道流血,检查:血压75/60mmHg,脉搏120次/分,面色苍白,宫底剑突下2横指,呈板状腹、有压痛,未闻及胎心音,最可能的诊断是哪项( )
A.
子宫破裂
B.
胎盘早剥
C.
前置胎盘
D.
羊水栓塞
E.
先兆子宫破裂