设H01=2.00mm,执行语句G90G01G44Z-40H01F100后，钻孔深度是（）

1．阅读程序，并回答问题。 在立式加工中心上，使用T2(?10)立铣刀，在Φ40外圆精铣10键槽，要求控制键槽宽度、深度为中差。键槽尺寸和工件坐标系如图所示。 要求： 1) 解释N110、N115、N120程序段的含义。 2) 刀具半径补偿值为5，铣削后，测量键槽宽度尺寸为11.8，再次铣削时为了确保键槽宽度为中差尺寸11.985，请计算刀具半径需要的补偿值。 3) 铣削后，测量键槽深度尺寸为35.1，再次铣削时为了确保键槽深度为中差尺寸34.9，请计算刀具长度需要的补偿值。 4) 绘制刀具在G17平面的编程路径。 N100 G21 N110 G91 G28 Z0 N115 T2 N120 M06 N130 G0 G54 G90 X0. Y0. S400 M3 N140 G43 H2 Z100. N150 Z23. N160 G1 Z15. F100. N170 G41 D2 X-6. F200. N180 G3 X0. Y-6. R6. N190 G1 X42. N200 G3 X48. Y0. R6. N210 X42. Y6. R6. N220 G1 X-42. N230 G3 X-48. Y0. R6. N240 X-42. Y-6. R6. N250 G1 X0. N260 G3 X6. Y0. R6. N270 G1 G40 X0. N280 G0 Z100. N290 G49 N300 M5 N310 G91 G28 Z0. N330 M30

电磁波频谱如以下表格：Electromagnetic spectrumFrequency (Hz)PhotonenergyeV NameWavelength () Gamma ray < 0.02 nm > 15 EHz > 62.1 keV X-ray 0.01 nm – 10 nm 30 EHz – 30 PHz 124 keV – 124 eV Ultraviolet 10 nm – 400 nm 30 PHz – 750 THz 124 eV – 3 eV Visible light 390 nm – 750 nm 770 THz – 400 THz 3.2 eV – 1.7 eV Infrared 750 nm – 1 mm 400 THz – 300 GHz 1.7 eV – 1.24 meV Microwave 1 mm – 1 m 300 GHz – 300 MHz 1.24 meV – 1.24 μeV Radio 1 mm – 100 km 300 GHz – 3 kHz 1.24 μeV – 12.4 feV Microwaves travel solely by line-of-sight paths; unlike lower frequency radio waves, they do not travel as ground waves which follow the contour of the Earth, or reflect off the ionosphere (skywaves). Although at the low end of the band they can pass through building walls enough for useful reception, usually rights of way cleared to the first Fresnel zone are required. Therefore, on the surface of the Earth, microwave communication links are limited by the visual horizon to about 30–40 miles (48–64 km). Microwaves are absorbed by moisture in the atmosphere, and the attenuation increases with frequency, becoming a significant factor (rain fade) at the high end of the band. Beginning at about 40 GHz, atmospheric gases also begin to absorb microwaves, so above this frequency microwave transmission is limited to a few kilometers. A spectral band structure causes absorption peaks at specific frequencies (see graph at right). Above 100 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that it is in effect opaque, until the atmosphere becomes transparent again in the so-called infrared and optical window frequency ranges. 下面描述错误的是：

A、微波工作频率介于射频及红外之间。

B、微波通信受大气吸收影响较大，衰减会随工作频率增加而加大。

C、微波导行系统一般功耗很大，无法长距离传输

D、微波通信有地波和天波 2 种模式

G90G01G44Z-50H02F100(H02补偿值2.00mm)

A、48mm;

B、52mm;

C、50mm

A、48mm

B、50mm

C、52mm

D、54mm

G90G01G43Z-50H01F100(H01补偿值-2.00mm)

A、48mm;

B、52mm;

C、50mm

A、48mm

B、52mm

C、50mm

D、都不对

A、48mm

B、52mm

C、50mm

D、都不对

A、48mm

B、52mm

C、50mm

D、46mm

A、－130mm

B、130mm

C、90mm

D、150mm