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【判断题】
射血分数是指搏出量占心室舒张末期容积的百分比。安静状态健康成人的射血分数约为55%~65%。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
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【判断题】1970年美国超级市场AdHoc委员会制定了通用商品代码——UPC码（Universal Product Code），此后许多团体也提出了各种条码符号方案。
A.
正确
B.
错误
【单选题】— Excuse me. Can you spare me a few minutes? — _____. [ ]
A.
What's on?
B.
What's more?
C.
What's up?
D.
What is it?
【单选题】―Do you have anything to do this afternoon? ―What’s up? ―Let’s go shopping. It’s said that Jinying Shop _____, and all the sweaters are sold at half price. ―Why not?
A.
has closed down
B.
was closing down
C.
closes down
D.
is closing down
【单选题】—Excuse me，can you spare me a few minutes? —________？
A.
What's on
B.
What's up
C.
What is it
D.
What's more
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