某受压细长杆件，两端校支，其临界力为为50kN，若将杆件支座形式改为两端固定，其临界力应为（）kN。 50 。 100 。 150 。 200 。
They have sold _____ their whole stock of frozen fish. forward 。 up 。 out 。 short。
We ____ allow you a 3% quantity discount(折扣) if your order exceeds 2,000 dozen. are prepared 。 are prepared to 。 will be prepared 。 will prepare。
Please quote us your lowest prices _____ CIf Singapore basis for embroidered silk blouses _____ prompt shipment. in, for 。 from, for 。 on, on。 from, on。
Every year, we export sunflower seeds ____ large quantities _____ the far East in, to 。 to, in 。 in, in 。 to, to。
The buyer should open the ______L/C 30 days _____the time of shipment.
