为了确定某化肥的种类，下列探究过程发生了化学变化的是 [ ]

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问题选择题

A.观察其外观，为白色晶体

B.闻其气味，无明显气味

C.测其溶解性，可溶于水

D.加熟石灰研磨，有刺激性气味

答案

答案：D

单项选择题

(71) is a one -way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(72) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(73) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.
(74) is a device used to connect two separate network that use different communication protocol.
(75) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

A．NNI

B．NRZ

C．NAK

D．NVT

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多项选择题

标线的实测项目有（）。

A、涂料厚度

B、标线宽度

C、标线长度

D、光度性能

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