综合通信大楼要求采用联合接地方式,其供电系统接地保护形式应采用()方式。
A、TT
B、IT
C、TN
D、TN-S-C
参考答案:C
—Will you ______ tall buildings next year?
—No, we are going to ______ a road next year. [ ]
A. build, built
B. built, build
C. build, build
D. builded, builded
吞咽反射不包括以下动作()
A.气道关闭
B.舌将食物压入咽部
C.咽缩肌收缩推动食团往下
D.环咽肌舒张以打开进入食管之门
E.软腭往上往后顶,避免鼻腔逆流