题目内容
（请给出正确答案）
[主观题]
求平面图形分别绕x轴、y轴旋转产生的立体的体积：在区间上，曲线y=sinx与直线y=0所围成的图形．
求平面图形分别绕x轴、y轴旋转产生的立体的体积：在区间【0，π】上，曲线y=sinx与直线y=0所围成的图形．
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B．Sequential logic circuits require a means by which events can be sequenced,while combinational logic circuits do not neeD
C．Combinational logic circuits are perfect for situations when we require the immediate application of a Boolean function to a set of inputs, however, sequential logic circuits to change its value with consideration to its current state as well as its inputs.
D．Combinational logic circuits are perfect for situations when we require the immediate application of a Boolean function to a set of inputs, so do sequential logic？ circuits.
