【单选题】下列分子或离子中,既有离子键又有共价键的是
【单选题】下列分子或离子中, 既有离子键又有共价键的是( )。
【单选题】下列分子或离子中,既有离子键又有共价键的是
【单选题】The buyer shall open with a bank acceptable to the seller an irrevocable sight L/C to reach the seller 30 days before shipment, valid for in China until the 15th day after shipment.
【单选题】下列分子或离子中,既有离子键又有共价键的是( )。
【单选题】With 15 days before shipment,both paties should negotiate and set price according to international price 是()
【单选题】下列分子或离子中,既有离子键又有共价键的是()。
【单选题】下列分子或离子中,既有离子键又有共价键的是: