烤岩屑的烤箱室必须要密封对吗?为什么?
参考答案:
不能密封;密闭的烤箱室易产生爆炸伤人。
________ you eat the correct foods ________ be able to keep fit and stay healthy.
A.Only if; will you
B.Only if; you will
C.Unless; will you
D.Unless; you will
如何控制与调整床温,及影响床温的因素有哪些?