皮皮学，免费搜题
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搜题
【单选题】
交替脉的特点A.
吸气时脉搏显著减弱或消失
B.
脉搏节律规整，但强弱交替
C.
脉搏骤起骤落
D.
脉搏洪大有力
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
【简答题】What did the doctor do?
【单选题】What did the doctor suggest?
A.
have some rest
B.
drink more water
C.
don't eat too many sweets and brush your teeth three times a day
D.
go to see the doctor
【单选题】What did the doctor do?
A.
She Took temperature.
B.
She gave some medicine.
C.
She gave some advice.
D.
All above.
【简答题】经济阈值(economic threshold)是 指应该采取防治措施时的( ),此时防治可防止发病数量超过经济损害水平,防治费用不高于因病害减轻所获得的收益。