【单选题】I had to work hard to t he other students.
【简答题】可用于直接配制标准溶液的是A. K2Cr2O7(A.R.) B. KMnO4(A.R) C. Na2S2O3·5H2O(A.R) D. NaOH(A.R)
【简答题】HLB值是指______。一般按HLB值选择乳化剂,HLB值低、亲油性强的乳化剂适用于W/O型体系中。
【简答题】语法专练( 2 月 25 日讲解 ) 1. Paul doesn ’ t have to be made ____. He always works hard. A. learn B. to learn C. learned D. learning 2. The boy wanted to ride his bicycle in the street,...
【单选题】可用于直接配制标准溶液的是 ( )
C.
Na 2 S 2 O 3 •5H 2 O(R)
【简答题】可用于直接配制标准溶液的是A. KMnO4(A.R) ; B. K2Cr2O7(A.R.) ; C. Na2S2O3 • 5H2O(A.R) D. NaOH(A.R) 。
【单选题】可用于直接配制标准溶液的是
C.
Na 2 S 2 O 3 .5H 2 O (R)
【单选题】舵机液压系统中有空气会导致______。
【简答题】3 语法专练( 2 月 25 日讲解 ) 1. Paul doesn ’ t have to be made ____. He always works hard. A. learn B. to learn C. learned D. learning 2. The boy wanted to ride his bicycle in the street, but his mot...
【简答题】HLB值是指( ),一般按HLB值选择乳化剂,HLB值为( )用于W/O型体系中,HLB值为( )用于O/W型体系。