18. 英國出口商與美國進口商簽訂之買賣契約中記載「交貨的品質與數量以英國公證行所簽發的檢驗證明書為準」，則此規定屬於下列何種品質數量條款？ (A)Landed Quality and Landed Weight (B)Shipping Quality and Landed Weight (C)Shipping Quality and Shipping Weight (D)Landed Quality and Shipping Weight。