某市一外语学校近期聘用了两名澳大利亚籍外教，其中一人持有效护照和居留许可，为某著名大

请从氮气、乙醇、盐酸、干冰、氢氧化钠、纯碱等六种物质中，按要求将相应物质的化学式填写在题中的空白处．

（1）可做制冷剂的物质是______；

（2）属于可再生能源的物质是______；

（3）可用于除去铁锈的酸是______；

（4）易潮解，可作某些气体干燥剂的物质是______．

链球菌致病性胞外分泌物是（）

A.链激酶、链道酶、胞壁多糖、透明质酸酶

B.链激酶、链道酶、链球菌溶血素、透明质酸酶

C.透明质酸酶、胞壁多糖、链道酶、链球菌溶血素

D.链道酶、链球菌溶血素、黏附素、红疹毒素

E.红疹毒素、胞壁多糖、透明质酸酶、链激酶

Alexei, Iulia and Leonid are partners in a commandite partnership. Alexei is the investing partner, having contributed capital of 500.000 roubles to the business under the partnership agreement. Iulia and Leonid are general partners. The partnership agreement states that all business will be carried out within the city boundaries of Moscow and that any transaction valued in excess of 750.000 roubles must be sanctioned by both general partners.Iulia has agreed to purchase raw materials from a company in Ekaterinberg in the name of the partnership for 1.000.000 roubles and has signed a contract with the seller to confirm this. On discovering the transaction, Leonid refused to sanction the payment. Iulia immediately resigned from the partnership in protest at Leonid’s action.Required:

(a) Explain whether the supplier of the raw materials is able to enforce the contract against the partnership. (5 marks)

下列哪些参数是交通流特征参数（）。

I、交通密度

II、交通速度

III、交通量

IV、航迹

V、船舶时距

A、I、II、V

B、I、II、IV

C、I、II、III、V

D、II、III、V

实行民主办学的基本要求？