【简答题】某兴趣小组在研究冰熔化实验时,发现冰熔化时有快有慢,他们想知道影响冰熔化速度的因素,于是提出了以下两种猜想: 猜想1:环境温度可能会影响冰熔化速度。 猜想2:冰的形状可能会影响冰熔化速度。 (1)请你列举生活中一个实例说明“猜想1”是合理的:______ (2)小丽同学对“猜想2”有自己的想法,为了验证“猜想2”,小丽设计了如下实验方案: (a)量出50mL蒸馏水3份,分别倒入容积都为50mL的长...
【单选题】. He was just about to give up and return to his bedroom for a good rest ________ he had a bright idea.
【单选题】In what way is Justin's backpack a smaller version of his bedroom?
A.
He uses it as a place to store objects.
B.
He uses it to carry his books and sports equipment.
C.
His parents tell him to clean it all the time.
D.
He's had it for as long as he can remember.
【单选题】关于螺杆和螺孔装配图的画法,哪一种判断正确?
【单选题】— . —He usually cleans his bedroom. [ ]
A.
How often does your brother clean his bedroom?
B.
What does your brother usually do on weekends?
C.
What's your brother's favorite program?
D.
How many hours does your brother sleep every night
【判断题】实行财政授权支付的支出包括暂未实行财政直接支付的专项支出和共用支
【简答题】某企业从20世纪50年代中期开始使用.PC机,历经3+网络、NOVELL网络的应用后着手组建企业网络。经过需求分析和论证,设计出如图所示网络方案。 (1)该企业网络的核心层采用了ATM技术,由三台ATM交换机互联构成。试对ATM网络技术的主要特点、协议分层结构和优点作简要叙述(控制在100个字以内)。 (2)PCI-PC4按100Mbps的以太网协议运行,PCI和PC2划分在一个虚拟网之中(vLA...