简述影响货品在储存空间摆放的因素。

额定功率为80kW的汽车，在平直公路上行驶的最大速度为20m/s，汽车的质量m=2×10³kg．如果汽车从静止开始做匀加速直线运动，加速度大小为2m/s²．运动过程中阻力不变，求：

（1）汽车所受的恒定阻力；

（2）3s末汽车的瞬时功率；

（3）汽车在匀加速运动过程中牵引力所做的功．

传染病流行过程的基本条件是（）

A.散发、流行、暴发

B.病原体、人体、外环境

C.自然因素、社会因素

D.传染源、传播途径、易感人群

E.患者、病原携带者、受感染的动物

Caz is a director of Dull plc, but she also carries out her own business as a wholesale supplier of specialist metals under the name of Era Ltd.Last year Dull plc entered into a contract to buy a large consignment of metal from Era Ltd. Caz attended the board meeting that approved the contract and voted in favour of it, without revealing any link with Era Ltd.Required:Analyse the situation explaining any potential liability that Caz may have in relation to the sale of the metal to Dull plc by Era Ltd. (10 marks)

Jack almost fell off the cliff, but managed to _____ until help came.

A．keep on

B．catch on

C．count on

D．hang on

我国周代实行的"六艺"教育是指"礼、乐、（）、（）、书、数"六个方面的内容。

A.射、御

B.射、骑

C.骑、御

D.攻、守