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在土中任一点的状态分析中，把为的面，称为主应力面，其中最大主应力的方向为方向。
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An IC datasheet contains at least the following information: product name, short functional description, pin connection diagram, and application circuit.
The NAND function is equivalent to an AND function with a NOT function at the output. The output is 0 only if both inputs are 1; if one input is 1 and the other is 0, or if both inputs are 0, then the output is 1.
In a 14-pin 74LS00 chip, each gate uses two pins for input and one pin for its output, and the remaining two contacts supply power ( +5 V ) and connect the ground.
Like a standard computer, the microcontroller includes a (), RAM, ROM, I/O ports, and timers.
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