【单选题】T he lecture given by Professor Johnson on the Antarctic is very attractive, and at the beginning, it is _____ asking us questions about the mysterious continent. [ ]
【判断题】力系简化所得的合力的投影和简化中心位置无关,而合力偶矩与简化中心的位置有关。
【简答题】计算机病毒的特点有寄生性、破坏性、传染性、 、隐蔽性
【单选题】According to David Vaughan, the Antarctic is shrinking due to climate change.
【简答题】脑位于 _____内,包括______、_______、_______、中脑______和_______。