根据超声波测距原理,选用高精度超声波探头,对E601B型蒸发器内水面高度变化进行检测,转换成电信号输出。并配置温度校正部分,以保证在使用温度范围内的测量精度。
参考答案:对
---According to my grandma, it is a good idea to eat chicken soup when you have a cold.
---_________,scientists agree with her.
A.Sooner or later
B.Once in a while
C.To be exact
D.Believe it or not
在典型的胃良性溃疡与恶性溃疡鉴别要点中,哪一项是良性溃疡的特征()
A.蠕动减弱
B.黏膜皱襞紊乱
C.龛影位于胃轮廓之内
D.龛影突出于胃轮廓之外
E.局部胃腔狭窄