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【单选题】
()的作用就是柔化生硬的光线,使光质变的更加柔和。A.
四叶挡板
B.
柔光箱
C.
标准罩
D.
反光伞
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【简答题】Text I The Law vs. the Piano My father was a lawyer with no sons, so he decided that his older daughter, Susie, would follow his career and take over his business when he died. When Susie was in kinde...
【单选题】若已知int x=10,y=20,z=30;执行以下语句后x、y、z的值是 if(x>y) z=x;x=y;y=z;
A.
x=10,y=20,z=30
B.
x=20,y=30,z=30
C.
x=20,y=30,z=10
D.
x=20,y=30,z=20
【简答题】The Law vs. the Piano My father was a lawyer with no sons, so he decided that his older daughter, Susie, would follow his career and take over his business when he died. When Susie was in kindergarten...
【多选题】关于灯具的安装，下列说法正确的有( )。
A.
变电所内，高低压配电设备及裸母线的正上方不应安装灯具
B.
装有白炽灯泡的吸顶灯具，灯泡不应紧贴灯罩；当灯泡与绝缘台间距离小于10mm时，灯泡与绝缘台间应采取隔热措施。白炽灯泡发热量较大，离绝缘台过近，不管绝缘台是木质的还是塑料制成的，均会因过热而易烤焦或老化，导致燃烧，故应在灯泡与绝缘台间设置隔热阻燃制品，如石棉布等
C.
安装在重要场所的大型灯具的玻璃罩，应采取防止玻璃罩碎裂后向下溅落的措施
D.
投光灯的底座及支架应固定牢固，枢轴应沿需要的光轴方向拧紧固定
E.
安装在室外的壁灯应有泄水孔，绝缘台与墙面之间应有防水措施
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