题目内容
在静止状态下，水银与水两种流体的单位质量力之比为（ ）。
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作用在静止流体上的单位质量力为（ ）。
When courage triumphed over fearSix years ago, when I took a flight, I saw real courage. Immediately upon _________, long before we had reached our ________________, it was clear that something was wrong. We ___________ travelers knew that they were just ____________________ and __________. Soon our _______________ were disappearing. The pilot soon provided some ______ news ________ the flight. Because of the problems with _______________, the passengers and the crew were all in danger. Most travelers looked ___________ and grim. However, somewhere in my _________, I __________ a still calm voice underlying the panic. This calm voice of a mother _______ a calm in me that quieted some of my ______ fears. Only the greatest courage had brought that mother up and ______ her above the chaos around her. It is the voice of true courage, showing the ________________ of love.
马铃薯匍匐茎开始膨大处于（ ）。
马铃薯为（ ）作物。
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