皮皮学，免费搜题
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【单选题】
角膜正常情况是不易患角膜炎的，因为角膜有多重保护机制，下列保护机制中错误的是：A.
泪液的冲刷
B.
泪膜的稳定
C.
每天滴抗生素滴眼液预防角膜感染
D.
眼睑和睫毛的保护
E.
角膜完整的上皮细胞保护
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】I had just started back for the house to change my clothes ________I heard voices.
A.
as
B.
when
C.
after
D.
while
【单选题】电压源和电流源的等效变换公式为:
A.
I S = R 0 × U S
B.
I S =U S /R 0
C.
I S =R 0 +U S
D.
I S =R 0 -U S
【简答题】I had just started back for the house to change my clothes I heard voices．
【单选题】It’s years since I _______ him last time, and I haven’t written back to him.
A.
heard of
B.
heard out
C.
heard about
D.
heard from
【单选题】下列表达式成立的是
A.
parseInt(12.5)==parseFloat(12.5)
B.
Number("123abc")==parseFloat("123abc")
C.
isNaN("abc")==NaN
D.
typeof NaN=="number"
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