【单选题】航海图一般采用(),这种投影具有等角航线为直线的特性,是海图制作所选择的主要投影。
【多选题】通常在弱电场下,可以用下列哪些参数来描述电介质特性
【单选题】— Do you know sound travels very fast? — Yes. But light travels sound.
【判断题】墨卡托投影的等角航线(斜航线)表现为直线。这一特性对航海具有重要意义。
【判断题】墨卡托投影的等角航线(斜航线)表现为直线,这一特性对航海具有重要意义。
【判断题】正轴等角圆柱投影不仅保持了方向和相对位置的正确,而且使等角航线在图上表现为直线。( )
【单选题】()具有等角航线表现为直线的特性,因此最适宜于编制各种航海图、航空图。
【单选题】病人,女,64岁。以广泛焦虑障碍入院,广泛焦虑的症状不包括
【单选题】How do we hear the amplified sound ?
A.
Sound waves are picked up by a speaker and converted to a small analog voltage called the audio signal, then the voltage are sent to the microphone.
B.
Sound waves are picked up by a microphone and converted to a small analog voltage called the audio signal, then the voltage are sent to the speaker .
C.
Sound waves are picked up by a microphone and converted to a small digital voltage called the audio signal, then the digital voltage are sent to the speaker