涂膜的耐候性是指涂膜抗大气环境作用的能力。( )
参考答案:对
However, at times this balance in nature is ________ resulting in a number of possibly unforeseen effects.
A. troubled B. bothered C mixed D. disturbed
变电电气装置安装施工,产品特别许可采用直搬法竖立时,()。
A.顶部支撑点应垫实
B.并采取防滚动措施
C.底部支撑点应垫实
D.并采取防滑措施