皮皮学,免费搜题
登录
搜题
【单选题】
Figure Problem shows a standing wave on a 2.0 m long string that has been fixed at both ends and tightened until the wave speed is 40 m/s . The frequency is _____________ .【图片】
A.
40Hz
B.
80 Hz
C.
160 Hz
D.
20 Hz
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】—Do you like table tennis or cycling? —______. [     ]
A.
No, I don't say
B.
Table tennis
C.
Yes, I do
D.
I don't
【单选题】在腰部,当后正中线上,第二腰椎棘突下凹线中穴是?
A.
肾俞。
B.
命门。
C.
脾俞。
D.
腰阳关。
【单选题】I like ______ table tennis. Would you like ______ table tennis in the afternoon? [     ]
A.
playing; to play
B.
playing; playing
C.
play; to play
D.
to play; playing
【多选题】管道刚性承插连接接头的嵌缝材料主要有( )。
A.
油麻
B.
膨胀水泥
C.
石棉水泥
D.
沥青
【简答题】原油在蒸馏前,一般先经过 、 处理
【单选题】在腰部,当后正中线上,第二腰椎棘突下凹陷中穴是
A.
腰俞
B.
命门
C.
悬枢
D.
腰阳关
【单选题】原油在蒸馏前,一般先经过( )处理。
A.
脱盐脱水
B.
脱硫、脱盐
C.
脱蜡、脱水
D.
脱盐、脱硫
【简答题】— Do you mind if I read the newspaper on the table? — _________________. A: Yes, sure B; Go ahead, please C; Good news for you
【简答题】听对话,给下列句子标号。 (     ) Can you set the table? (     ) Can you wash the clothes? (     ) No, I can't, but I'd like to have a try! (     ) Yes, I can. I can do the dishes, too.
【单选题】在腰部,当后正中线上,第二腰椎棘突下凹陷中穴是( )。
A.
肾俞
B.
命门
C.
脾俞
D.
腰阳关
E.
胃俞
相关题目: