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问题 选择题

已知Rt△ABC中，∠C=90°，若a+b=14cm，c=10cm，则Rt△ABC的面积是 [ ]

A.24cm2

B.36cm2

C.48cm2

D.60cm2

答案

答案：A

单项选择题

Stretchers are fitted in lifeboats to provide a（）.

A.place for people to lie down

B.means for rigging the sail

C.place for rowers to brace their feet

D.suitable means for water to drain below the footings
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单项选择题

乳腺癌的超声特征是

A．边界不整，呈锯齿状，无包膜B．内部呈低回声区
C．后方回声呈衰减暗区D．向组织及皮肤浸润E．以上都是
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