皮皮学，免费搜题
登录
搜题
【单选题】
物体振动在介质中单位时间内传播的距离称为（ ）。A.
波长
B.
周期
C.
频率
D.
声速
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【判断题】That night Porter read through company literature and discovered the products were guaranteed
A.
正确
B.
错误
【单选题】下列农药残留危害的说法中,错误的是
A.
有机磷农药有迟发性神经毒性
B.
氨基甲酸酯类农药是可逆性胆碱酯酶抑制剂
C.
拟除虫菊酯属于中等毒或低毒
D.
除草剂在农作物的收获期使用，危害性较大
E.
多种农药混配使用可提高药效，延缓昆虫和杂草产生抗药性，但有时可使毒性增强
【单选题】Night-shift workers are those who ______．
A.
have to pay on their internal clock
B.
need to re-adjust their clock
C.
fall asleep late at night
D.
have to work at night
【简答题】That night Porter read through company literature and discovered the
【单选题】If you’re sitting around a lonely campfire at night, the howl of a wolf can sound pretty ______.
A.
fearful
B.
threatening
C.
dreadful
D.
frightening
【单选题】We're talking about the piano and the pianist _____ were in the concert we attended last night. [ ]
A.
which
B.
whom
C.
who
D.
that
相关题目：
参考解析：
知识点：
题目纠错 0
发布
