单项选择题

结构石，又称构造石，顾名思义具有一定结构框架的石品。这是地质学中一种叫“ ”的现象造成的。

A．结构
B．构造
C．泥裂
D．构架

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（）适合制机床主轴。

A.20CrMnTi
B.45
C.20
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According to the nature ofcause of disease, plant diseases are classified as follows:
A、Infectious diseases and Noninfectious diseases
B、Infectious diseases and biological diseases
C、Noninfectious diseases and abiotic diseases
D、Infectious diseases and biotic diseases