超声波传感器表面结冰时依旧能照常工作。()
参考答案:错
The Internet connection for the entire area _________ when there was a sudden power cut yesterday.[ ]
A. lost
B. was lost
C. had lost
D. had been lost
以下属于无效合同是()。
A、一方以欺诈的手段,使对方在违背真实意思的情况下订立的合同
B、因重大误解订立的合同
C、以合法形式掩盖非法目的的合同
D、恶意串通,损害国家、集体或者第三人利益的合同