【单选题】关于钢材材料的化学成分,说法错误的是( )。
A.
硅在钢中的含量较低(小于1%)时,随着含量的加大可提高钢材的强度
B.
硫化物造成的低熔点使钢在焊接时易于产生热裂纹,显著降低可焊性
C.
锰是有害的元素,呈非金属硫化物夹杂物存于钢中,具有强烈的偏析作用,降低各种机械性能
D.
磷为有害元素,含量提高,钢材的强度提高,塑性和韧性显著下降
【单选题】患者,男,54岁,外伤性肠穿孔修补术后2天,肠蠕动未恢复,腹胀明显,其护理措施最重要的是
【简答题】阅读理解。 Welcome to My Birthday Party Helen: Hi, everyone. Welcome to my birthday party. Tom: Happy birthday! Peter: Enjoy yourself today, Helen. Helen: Thanks a lot. It’s my pleasure for you to join in ...
【单选题】Welcome _____________ my home. [ ]
【简答题】My ______ (appear) at the party was not very welcome.
【单选题】This Saturday is my _______ birthday. Welcome to my party!
【单选题】Welcome _____________ my home. [ ]
【简答题】阅读理解。 Welcome to My Birthday Party Helen: Hi, everyone. Welcome to my birthda y party. Tom: Happy birthday! Peter: Enjoy yourself today, Helen. Helen: Thanks a lot. It’s my pleasure for you to join in...
【单选题】男,54岁,外伤性肠穿孔修补术后2天肠蠕动未回复,腹胀明显,其护理哪项最重要