题目内容：
雨淋报警阀组调试时，雨淋报警阀在联动信号发出或者手动控制操作后（ ）内启动。
A．15s B．30s
C．60s
D．90s
参考答案：
单选题：雨淋报警阀组调试时，雨淋报警阀在联动信号发出或者手动控制操作后（ ）内启动。
- 题目分类：消防安全技术综合能力
- 题目类型：单选题
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B．30s
C．60s
D．90s
B．30s
C．60s
D．90s
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构图的基本要素有形状、线条、明暗、色彩等。在做以线造型的素描构图练习中，运用的主要是形状和（ ）两要素。 A．线条 B．明暗 C．色彩 D．构成
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