某气瓶为银灰色，字色为深绿色，则此气瓶内充装的气体为( )。A．氯气B．二氧化碳C

妊娠合并梅毒治疗原则以下哪项不正确（）

A.治疗期间不需禁止性生活

B.用药足量

C.及时治疗

D.疗程规范

E.早期确诊

根据化学剂对油层和水层的堵塞作用而实施的化学堵水可分为（）和（；）。

下列是科学研究中常用的方法或技术，不正确的是（）

A.研究光合作用释放的O₂是来自于H₂O还是来自于CO₂：同位素标记法

B.萨顿的假说：类比推理

C.摩尔根证明基因在染色体上：假说一演绎法

D.提取绿色植物叶绿体中的色素：纸层析法

The software architecture of a program or computing system is the structure or structures of the system, which comprise software______, the externally ______ properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a ______ that enables a so, ware engineer to: analyze the ______ of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the ______ associated with the construction of the software.

A．changeability
B．effectiveness
C．testability
D．functionality

进行短路试验应注意的事项是哪些？