单项选择题
云计算可以认为包括以下几个层次的服务：基础设施即服务（IaaS），平台即服务（PaaS）和软件即服务（SaaS）。 A. 对 B. 错
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问答题
现阶段电动汽车的主流动力电池类型分为(____)、(____)、(____)、(____)四种。 -
单项选择题
If the feed is introduced at one point along the column shell, the column is divided into an upper section, which is often called the stripping section, and a lower section, which is often referred to as the rectifying section.
A．对
B．错 -
单项选择题
选出单词中画线部分正确的读音 knock A、/m/ B、/n/ C、/ŋ/
